Complete the questionnaire to determine the right jet for your application.

MJP Power Ranges

MJP UltraJet input power 100 - 1500 kW (130 - 2.000 bhp)

MJP CSU input power 1000 - 15,000 kW (1340 - 20,000 bhp)

MJP DRB input power 500 - 2500 kW (670 - 3,350 bhp)

The MJP Aqua Jets are suited to high-speed vessels operating in the 20 to 50 knot range. MJP also offers models optimized for displacement and semi-displacement craft.

Product Range

MJP Ultrajet 251-340

350 up to 600 HP

Power Range 100 - 450 kW

MJP UltraJet 251

354 MHP, 350 BHP, 261 kW

250 mm / 9.8 inch impeller

MJP Ultra Jet 251 HT

370 MHP, 364 BHP, 275 kW

250 mm / 9.9 inch impeller

MJP UltraJet 305

456 MHP, 450 BHP, 335 kW

305 mm / 12.0 inch impeller

MJP UltraJet 305 HT

400 MHP, 394 BHP, 298 kW

340 mm / 13.4 inch impeller

MJP UltraJet 340

608 MHP, 600 BHP, 448 kW

833 mm / inch impeller

MJP UltraJet 340 HT

550 MHP, 542 BHP, 410 kW

926 mm / 36.46 inch impeller

MJP Ultrajet 377 - 575

800 up to 1800 BHP

Power Range 500 - 1,500 kW

MJP UltraJet 377

811 MHP, 800 BHP, 597 kW

926 mm / 36.46 inch impeller

MJP UltraJet 410

1013 MHP, 1000 BHP, 746 kW

926 mm / 36.46 inch impeller

MJP UltraJet 452

1216 MHP, 1200 BHP, 900 kW

450 mm / 17.7 inch impeller

MJP UltraJet 525

1495 MHP, 1475 BHP, 1100 kW

525 mm / 20.7 inch impeller

MJP UltraJet 575

1825 MHP, 1800 BHP, 1342 kW

575 mm / 22.6 inch impeller

MJP UltraJet Control Systems

The MJP-UltraJet Hydro mechanical and Electrohydraulic control systems offers complete control of vessel maneuvering by controlling steering, reversing, side movements, rotation or crash stop. The four primary MJP UltraJet control systems cover a wide range of application requirements.

Hydro mechanical (HM) Control

The Hydro mechanical reversing control provides proportional operation of the reversing deflector (bucket) when actuated by a push/pull cable from the helm. The HM control converts minimal effort at the helm to hydraulic actuation of the reverse deflector, even at full throttle. The HM control is available for the MJP UltraJet models 251, 251HT, 305, 305HT, 340, 340HT, 377, and 410.

Electrohydraulic Proportional (EHK) Control

The economical Electrohydraulic Proportional Control operates the reversing deflector proportionally to helm lever movement. The EHK system is utilizes components from Kobelt's durable ship rudder control. The reversing deflectors are actuated at the helm with single or twin-lever helm units.

JetMaster-Pro Electrohydraulic (JMP) Control

The economical Electrohydraulic Proportional control operates the reversing deflector proportional to helm lever movement. The EHK system is utilizes components from Kobelt's durable ship rudder control. The reversing deflectors are actuated at the helm with single or twin-lever helm units.

JetMaster Joystick Electrohydraulic (JMJ) Control

Ultra Dynamics, formerly Ultra Hydraulics, have supplied joystick controls for vessels since 1995. These Ultra-developed joystick systems are used to accurately control forward, reverse and neutral positioning of the boat using vectored thrust from the jet drive(s). The JetMaster Joystick controls are available for all UltraJet models. The control system provides excellent maneuverability in all directions including rotation around boat center and sideways movement for docking.

JetMaster Wind farm Service Vessel (JMWFSV) Control

The JM Wind farm Boat control system has been developed for the unique operating requirements of wind farm service boats.

MJP-UltraJet Application Guidelines

While many water jets look similar, each brand and model has different operating functionality. Water jet attributes are best matched to the hull design, and application requirements.

The following documents provide more information about the range of water jets available to support application specification.

Jet-Boat Design Considerations

This PDF document provides a systemic approach for successful application of marine waterjet propulsion. Similar to other propulsion methods, a successful waterjet-propelled boat requires the operation of four elements in union; Mission, Hull, Power Source, and Propulsion (water jet). This document explores design and operation considerations for each element based on our experience, the experience of various boat builders and jet manufacturers, technical papers, and other sources.

Specification Considerations for Marine Waterjet Propulsion

Often, the specification of a waterjet-propelled boat is based only on maximum speed at full throttle in calm water. However, engine manufacturers need their engines to run at less than full throttle; boats become heavier in service, and the boats need to operate in less than ideal sea and wind conditions. Jet selection should always incorporate boat performance at cruise throttle in less than ideal conditions.

Nacelles for Optimizing UltraJet Propulsion

Nacelles have been applied by a number of boat builders to optimize hulls for water jet propulsion in single and twin-jet monohulls and catamarans. The nacelle concept is especially useful to adapt hulls not normally considered suitable for waterjet propulsion.